142 lines
4.5 KiB
ReStructuredText
142 lines
4.5 KiB
ReStructuredText
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.. _`pytest helpers`:
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Pytest API and builtin fixtures
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================================================
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This is a list of ``pytest.*`` API functions and fixtures.
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For information on plugin hooks and objects, see :ref:`plugins`.
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For information on the ``pytest.mark`` mechanism, see :ref:`mark`.
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For the below objects, you can also interactively ask for help, e.g. by
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typing on the Python interactive prompt something like::
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import pytest
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help(pytest)
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.. currentmodule:: pytest
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Invoking pytest interactively
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---------------------------------------------------
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.. autofunction:: main
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More examples at :ref:`pytest.main-usage`
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Helpers for assertions about Exceptions/Warnings
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--------------------------------------------------------
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.. autofunction:: raises
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Examples at :ref:`assertraises`.
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.. autofunction:: deprecated_call
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Comparing floating point numbers
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--------------------------------
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.. autoclass:: approx
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Raising a specific test outcome
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--------------------------------------
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You can use the following functions in your test, fixture or setup
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functions to force a certain test outcome. Note that most often
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you can rather use declarative marks, see :ref:`skipping`.
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.. autofunction:: _pytest.runner.fail
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.. autofunction:: _pytest.runner.skip
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.. autofunction:: _pytest.runner.importorskip
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.. autofunction:: _pytest.skipping.xfail
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.. autofunction:: _pytest.runner.exit
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Fixtures and requests
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-----------------------------------------------------
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To mark a fixture function:
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.. autofunction:: _pytest.fixtures.fixture
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Tutorial at :ref:`fixtures`.
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The ``request`` object that can be used from fixture functions.
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.. autoclass:: _pytest.fixtures.FixtureRequest()
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:members:
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.. _builtinfixtures:
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.. _builtinfuncargs:
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Builtin fixtures/function arguments
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-----------------------------------------
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You can ask for available builtin or project-custom
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:ref:`fixtures <fixtures>` by typing::
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$ pytest -q --fixtures
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cache
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Return a cache object that can persist state between testing sessions.
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cache.get(key, default)
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cache.set(key, value)
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Keys must be a ``/`` separated value, where the first part is usually the
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name of your plugin or application to avoid clashes with other cache users.
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Values can be any object handled by the json stdlib module.
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capsys
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Enable capturing of writes to sys.stdout/sys.stderr and make
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captured output available via ``capsys.readouterr()`` method calls
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which return a ``(out, err)`` tuple.
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capfd
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Enable capturing of writes to file descriptors 1 and 2 and make
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captured output available via ``capfd.readouterr()`` method calls
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which return a ``(out, err)`` tuple.
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doctest_namespace
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Inject names into the doctest namespace.
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pytestconfig
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the pytest config object with access to command line opts.
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record_xml_property
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Add extra xml properties to the tag for the calling test.
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The fixture is callable with ``(name, value)``, with value being automatically
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xml-encoded.
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monkeypatch
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The returned ``monkeypatch`` fixture provides these
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helper methods to modify objects, dictionaries or os.environ::
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monkeypatch.setattr(obj, name, value, raising=True)
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monkeypatch.delattr(obj, name, raising=True)
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monkeypatch.setitem(mapping, name, value)
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monkeypatch.delitem(obj, name, raising=True)
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monkeypatch.setenv(name, value, prepend=False)
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monkeypatch.delenv(name, value, raising=True)
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monkeypatch.syspath_prepend(path)
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monkeypatch.chdir(path)
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All modifications will be undone after the requesting
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test function or fixture has finished. The ``raising``
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parameter determines if a KeyError or AttributeError
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will be raised if the set/deletion operation has no target.
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recwarn
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Return a WarningsRecorder instance that provides these methods:
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* ``pop(category=None)``: return last warning matching the category.
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* ``clear()``: clear list of warnings
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See http://docs.python.org/library/warnings.html for information
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on warning categories.
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tmpdir_factory
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Return a TempdirFactory instance for the test session.
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tmpdir
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Return a temporary directory path object
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which is unique to each test function invocation,
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created as a sub directory of the base temporary
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directory. The returned object is a `py.path.local`_
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path object.
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